Critical Size for the Observation of Quantum Confinement in Optically Excited Gold Clusters

Critical Size for the Observation of Quantum Confinement in Optically Excited Gold Clusters

We present a systematic study of optical properties of a series of hexanethiolate-capped Au clusters of varying sizes using femtosecond transient absorption, time-resolved fluorescence, and two-photon absorption cross-sectional measurements. An abrupt change in optical properties and their trends ha...

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Veröffentlicht in:Journal of the American Chemical Society 2010-01, Vol.132 (1), p.16-17
Hauptverfasser: Varnavski, Oleg, Ramakrishna, Guda, Kim, Junhyung, Lee, Dongil, Goodson, Theodore
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creator Varnavski, Oleg
Ramakrishna, Guda
Kim, Junhyung
Lee, Dongil
Goodson, Theodore
description We present a systematic study of optical properties of a series of hexanethiolate-capped Au clusters of varying sizes using femtosecond transient absorption, time-resolved fluorescence, and two-photon absorption cross-sectional measurements. An abrupt change in optical properties and their trends has been found at the 2.2 nm size. Displacively excited vibrations with a period of 450 fs have been detected in the transient absorption signal for smaller clusters ≤2.2 nm. These results strongly suggest an emerging optical gap between the highest occupied and lowest unoccupied orbitals in the narrow size range at 2.2 nm.
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title Critical Size for the Observation of Quantum Confinement in Optically Excited Gold Clusters
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